DC Ladies! I need your help.

I was listening to a radio show based in DC, and the hosts (women, for godsake!) started out talking about people taking up all the space on jogging paths, but then morphed into them complaining about cyclists on the roads in DC. They said that there are bike paths everywhere, especially over bridges, and that the bikes should be there, or on the sidewalk.

I'm working on a letter to the show, and need to know if there are indeed bike lanes everywhere, especially on the bridges. They mentioned a park (where that poor girl was murdered who was connected to a senator?) and said that the bikes are all in the road and not on the bike path/lanes. I need to know if there are true bike lanes, or just the paths that are shared with walkers/joggers/toddlers/dogs, etc.

Thanks!